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Figure 7 (continued) Pile-driving equipment: (c) double-acting
and differential air or steam hammer; (d) diesel hammer
Diesel hammer (Figure 7d)
consists essentially of a ram, an anvil block, and a
fuel-injection system.
• First the ram is raised and fuel is injected near the
anvil. Then the ram is released.
• When the ram drops, it compresses the air–fuel
mixture, which ignites. This action, in effect,
pushes the pile downward and raises the ram.
• In soft soils, the downward movement of the pile is
rather large, and the upward movement of the ram
is small.
• This differential may not be sufficient to ignite the
air–fuel system, so the ram may have to be lifted
manually.
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